I have 4:
Pig-can move 2 squares in any direction
Hog: Can move 2 Squares or 1 square in any direction. Can Jump over pieces
Boar: A bishop that can jump over pieces and capture till it reaches the end of the board. Cannot change directions
Bull: A rook that can jump over pieces and capture till it reaches the end of the board. Cannot change directions
Geek:
The geek can't move but if an ennemi piece (or pawn) stand right next to him, then the piece (or pawn), him capture range is upped by 1 per pawn and 2 per pieces, but can't never get upper than 5.
Also it doesn't take the players turn and can capture many pieces and pawns if they become in the geek's capture range.
8 by 8 square or more recommanded.